Planetary Gear System for Compact Strapping Device Torque
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mobile strapping devices for packaging goods face challenges in achieving high functional reliability and compact design due to the complexity and weight distribution associated with automated processes, which also increase maintenance costs and risk of damaging sensitive goods during tensioning.
Innovation Solution
Incorporation of a planetary gear system and a brushless direct current motor in the drive train of the strapping device, allowing for high torque production and speed-controlled tensioning, along with a toggle lever system for reliable movement of the welding device, to enable efficient and compact operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated production processes are implemented in strapping devices, then productivity and functional reliability are improved, but device complexity and weight increase
Solution Approach 1:
The patent combines multiple drive functions into a single electric motor that powers both the tensioner and friction welder through a planetary gear system. This integration reduces the number of separate motors and components while maintaining automated functionality, directly addressing the contradiction between productivity improvement and device complexity increase
Solution Approach 2:
The planetary gear system serves multiple functions: it provides torque multiplication for the friction welder, enables speed control for the tensioner, and facilitates automated operation. This multi-functionality allows a single drive system to perform what would traditionally require multiple separate mechanisms, reducing overall device complexity while maintaining high productivity
2Force
If high strap tension is applied to packaged goods, then strapping effectiveness is improved, but risk of damaging sensitive goods increases
Solution Approach 1:
The patent employs dynamic tensioning control where the electric motor's speed and torque are continuously adjusted during the strapping process. The planetary gear system enables smooth variation of output torque, allowing the tensioner to apply gradually increasing force rather than sudden high tension, thus protecting sensitive goods while achieving effective strapping
Solution Approach 2:
The system changes operational parameters (motor speed, gear ratio selection) during the strapping process to optimize the tensioning curve. By controlling the rate of tension application and maintaining optimal force levels, the device achieves effective strapping without exceeding damage thresholds for sensitive packaged goods
3Force
If planetary gear system is used for torque multiplication, then high torque is achieved, but device weight and volume increase
Solution Approach 1:
The planetary gear system is integrated within the existing drive train structure, with gears nested concentrically around the motor shaft. This compact nesting arrangement minimizes the space occupied by the torque multiplication mechanism, reducing the overall device volume and weight while still achieving the necessary high torque output for friction welding
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a compact, functionally reliable strapping device that can safely tension and weld plastic straps around sensitive goods with reduced risk of damage, while minimizing maintenance costs and operator effort.
Implementation Method 1
a planetary gear system for transferring and changing the rotational speed of a drive movement provided by an electrical drive of the friction welder
Implementation Method 2
a friction welder for producing a friction weld at two areas of the loop of wrapping strap disposed one on top of the other... The pressure and the heat produced by the movement briefly locally melt the strap which generally contains a plastic
Data Source
AI summary
A mobile strapping device for strapping packaged goods with wrap-around strap including a tensioner for applying a strap tension to a loop of a wrapping strap, and a friction welder for producing a friction weld connection by way of a friction welding element at two areas of the loop of the wrapping strap disposed one on top of the other, and a chargeable energy storage means for storing electrical energy that can be released as drive energy for motorized drive motions at least for the friction welder for producing a friction weld connection. For a strapping device with high functional reliability and ease of handling, despite the possibility of automated production of wrapped straps, at least to a large extent, the strapping device to includes a planetary gear system for transferring and changing the rotational speed of a drive motion provided by an electrical drive of the friction welder.